粒状体解析手法による岩石の亀裂進展挙動に関する検討

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Crack propagations in rock will affect stability of rockmass structures. It is important to predict the crack propagation in rock in order to design the suitable reinforcement or support system. Therefore, authors focus on a distinct element method based on discontinuum mechanics. In this method, a material is expressed as assemblies of rigid circular particles, and input parameters are not mechanical properties of the material, such as Youngs modulus and Poissons ratio, but microscopic parameters related to each particle. This paper firstly describes the numerical simulation using Particle Flow Code (PFC2D) of uniaxial compressive test and Brazilian test so as to determine the proper microscopic parameters of Kimachi sandstone. Stress-strain curves obtained from the uniaxial compressive tests and tensile stress-axial strain curves obtained from the Brazilian tests show that the model can represent not only uniaxial compressive strength, Youngs modulus, Poissons ratio, but also tensile strength, by adopting the clump model. And then numerical simulations of mode I, mode II, and mixed mode fracture toughness testing using Semi-Circular Bend (SCB) specimen are conducted. The results of the simulation are compared with the experimental data. It is found that the differences of the fracture toughness values obtained by the numerical simulation and experiments are within 10%. The locations of the failure plane by the numerical simulation are good agreement with that observed by experiments. In conclusion, the Particle Flow Code can simulate both crack resistance properties and direction of the crack propagation in rock.

粒状体解析手法による岩石の亀裂進展挙動に関する検討

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